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install sound drivers..if drivers are installed then goto control panel --> sound and audio devices --- > then click that and see whether any SoundCard is installed or not.. for example- Realtek AC 97 . it should be there .. are u getting sound at the startup of the windows or not...check that ...if sound comes then the problem is with the software u are using to play the movies .... try to install another software ...i personally recommend vlc media player.. to get goto www.download.com and search for VLC media player ....download it and install ...your problem will be solved..
what is the error? wrong codec or no audio device installed/detected? in the case of the first problem, try downloading something like k-lite codec pack. otherwise you have the wrong audio drivers installed. for that you need your motherboard number, google for it for the right drivers, or alternatively download everest, find your audio model number, and download drivers for the mdel via google.
Your sound device is either damaged or has no driver installed. Look in Control Panel/System/Hardware/Device Manager for yellow marks. You'll find the driver at the Compaq site. I can't help you further without a model number.